Threat Description

Backdoor:​W32/​Bifrose.BGE

Details

Summary

Backdoor:W32/Bifrose.BGE may arrive on the system as a drop file of other malware
packages or may be downloaded from the Internet by other malware or unknowing users.
When Running, this malware will constantly connect to a remote site where it awaits
commands from a remote user.

Removal

Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.

Technical Details

Upon execution, Bifrose.BGE, drops a text file and opens it using Internet Explorer
in an attempt to mask its malicious behavior.The text file is created on the user's
Desktop as:

36146.txt

The main malware component is then dropped and executed in the system as:

%My Documents%\msnmsgr_plugin.exe

Once the control has been transfered, this malware then creates a copy of itself in
the following folder:

%Program Files%\Microsoft Live

The copy is named MsnMsgr.exe with the file and folder attributes set to hidden.A
startup registry entry is then created:

This entry holds data needed by this malware.Once loaded in memory, this malware then
injects its code to Explorer's process space where when executed, it will spawn a
hidden browser process that will constantly connect to:

Artkill.Dyndns.Org TCP PORT 81

It then receives commands from the remote attacker and downloads other components
that it needs.When an Internet connection is detected, the malware will download an
additional component to be saved as TORplugin.dat, which when configured, will provide
basic stealth using the TOR network.

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